Yeah, Bush should be in jail, so should Cheney, Rumsfeld, and a dozen others. But thing is, during this presidency there was an attempt to sanction a president, to impeach him that he may be removed from office and stand trial, and it failed because the republicans decided that having their man on the throne was more important than justice. Your entire argument seems to be based on the assumption that we are okay with previous administrations avoiding punishment, most of us are not.
Donald Trump have been blatant in his misuse of power and corruption, and in most cases an argument of national interest cannot reasonably be made, so of course it is easier to make a case against the man, that is why we're pushing so hard, because it should be a win, because the smoking gun is there.
And I don't buy that "he's an agitator" crap, he is a figurehead that signs the worst kind of legislation for the worst kind of people and is defended by a media outlet that is by all standards part of the news establishment.
The "next election" argument is somewhat reasonable, but impeachment is an actual tool meant to remove unfit presidents, however the establishment saw fit to protect one of the most unfit characters the US has ever seen. And with the entrenchment and manipulation from the republican party, both state and federal, I wouldn't hold my breath when it comes to fair elections.